156 State Horticultural Society. 



away and the solution applied to the wounds only, the one pound to 

 eight gallons strength killed all the trees. Some few of the others 

 were injured, but the galls continued to grow. 



Ammonia Water. — Killed many of the trees, but was not as disas- 

 trous as formalin or bluestone. Did not stop the growth of the galls. 

 Treatment of the wounds with the strongest solution to be found did 

 not prevent the galls growing again. 



Corrosive Sttblimate. — Caused but little injury to the trees and did 

 not kill the galls. 



Aw.moniacal Copper Carbonate Solution, in strengths of i to lOO to 

 1 to 250, killed most of the trees. Weaker solutions affected the 

 trees to a slight extent. This material entirely stopped the growth 

 of galls in some cases and in others seemed to retard it. 



Copperas. — Caused no serious injury to trees even where large 

 wounds were made by removing the galls. The galls were very 

 numerous. 



Carbolic Acid. — Killed or injured many trees, but seemed to retard 

 growth of galls in some instances. 



Hydrocyanic Acid. — Was used only to apply to wounds. It killed 

 most of the trees treated. The galls grew again wherever trees lived. 



Potassium Dichromate. — Was used only on wounds. Nearly all 

 trees killed. Galls grew on uninjured ones. 



Mercuric Cyanide. — Killed all the trees. Material applied only to 

 wound where galls were removed. 



Silver Nitrate. — Applied to wounds only. Trees bady injured, but 

 in most instances galls continued to grow. 



Gas Tar. — Was used to paint over the wounds. Killed all the trees. 



Coal Oil {Kerosene). — Killed most of the trees with strengths of 

 I to 10 down to I to 100. Galls continued to grow on the live trees. 

 The I to 10 and i to 25 on the wounds killed ail the trees. Strengths 

 of I to 50 and i to too on the wounds killed much of the gall, but 

 injured some of the trees. 



Sulphur. — ^Mixed in the soil around the trees in quantities of i to 

 8 ounces per tree. Killed over half the trees, but seemed to prevent 

 growth of galls. 



Common Salt. — In quantities of 2 ounces or more in the soil. Killed 

 most of the trees, but where trees survived did not prevent growth 

 of gall. 



Copperas, Bluestone and Lime mixed together and applied to the 

 wounds was the best remedy of al! for preventing a new growth of 

 galls, although this was not entirely efficacious. Several trees were 



